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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_MAP_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_MAP_H_
#include "third_party/blink/renderer/platform/fonts/font_cache_client.h"
#include "third_party/blink/renderer/platform/fonts/font_description.h"
#include "third_party/blink/renderer/platform/fonts/font_fallback_list.h"
#include "third_party/blink/renderer/platform/fonts/font_selector_client.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class FontSelector;
// This class acts as a cache ensuring that equivalent `FontDescription`s will
// have the same `FontFallbackList`.
//
// This class doesn't retain the `FontFallbackList`s however, only having a weak
// reference to them.
class PLATFORM_EXPORT FontFallbackMap : public FontCacheClient,
public FontSelectorClient {
public:
explicit FontFallbackMap(FontSelector* font_selector)
: font_selector_(font_selector) {}
FontSelector* GetFontSelector() const { return font_selector_.Get(); }
FontFallbackList* Get(const FontDescription& font_description);
void Trace(Visitor* visitor) const override;
private:
// FontSelectorClient
void FontsNeedUpdate(FontSelector*, FontInvalidationReason) override;
// FontCacheClient
void FontCacheInvalidated() override;
void InvalidateAll();
template <typename Predicate>
void InvalidateInternal(Predicate predicate);
const Member<FontSelector> font_selector_;
HeapHashMap<FontDescription, WeakMember<FontFallbackList>>
fallback_list_for_description_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_MAP_H_
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